view data/model/EditableDenseThreeDimensionalModel.h @ 961:fae5689f7e27

Frame this condition more defensively (from coverity scan)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _EDITABLE_DENSE_THREE_DIMENSIONAL_MODEL_H_
#define _EDITABLE_DENSE_THREE_DIMENSIONAL_MODEL_H_

#include "DenseThreeDimensionalModel.h"

#include <QReadWriteLock>

#include <vector>

class EditableDenseThreeDimensionalModel : public DenseThreeDimensionalModel
{
    Q_OBJECT

public:

    // EditableDenseThreeDimensionalModel supports a basic compression
    // method that reduces the size of multirate data (e.g. wavelet
    // transform outputs) that are stored as plain 3d grids by about
    // 60% or thereabouts.  However, it can only be used for models
    // whose columns are set in order from 0 and never subsequently
    // changed.  If the model is going to be actually edited, it must
    // have NoCompression.

    enum CompressionType
    {
        NoCompression,
        BasicMultirateCompression
    };

    EditableDenseThreeDimensionalModel(int sampleRate,
				       int resolution,
				       int yBinCount,
                                       CompressionType compression,
				       bool notifyOnAdd = true);

    virtual bool isOK() const;

    virtual int getSampleRate() const;
    virtual int getStartFrame() const;
    virtual int getEndFrame() const;

    virtual Model *clone() const;
    

    /**
     * Set the frame offset of the first column.
     */
    virtual void setStartFrame(int);

    /**
     * Return the number of sample frames covered by each set of bins.
     */
    virtual int getResolution() const;

    /**
     * Set the number of sample frames covered by each set of bins.
     */
    virtual void setResolution(int sz);

    /**
     * Return the number of columns.
     */
    virtual int getWidth() const;

    /**
     * Return the number of bins in each set of bins.
     */
    virtual int getHeight() const; 

    /**
     * Set the number of bins in each set of bins.
     */
    virtual void setHeight(int sz);

    /**
     * Return the minimum value of the value in each bin.
     */
    virtual float getMinimumLevel() const;

    /**
     * Set the minimum value of the value in a bin.
     */
    virtual void setMinimumLevel(float sz);

    /**
     * Return the maximum value of the value in each bin.
     */
    virtual float getMaximumLevel() const;

    /**
     * Set the maximum value of the value in a bin.
     */
    virtual void setMaximumLevel(float sz);

    /**
     * Return true if there are data available for the given column.
     */
    virtual bool isColumnAvailable(int x) const { return x < getWidth(); }

    /**
     * Get the set of bin values at the given column.
     */
    virtual Column getColumn(int x) const;

    /**
     * Get a single value, from the n'th bin of the given column.
     */
    virtual float getValueAt(int x, int n) const;

    /**
     * Set the entire set of bin values at the given column.
     */
    virtual void setColumn(int x, const Column &values);

    /**
     * Return the name of bin n. This is a single label per bin that
     * does not vary from one column to the next.
     */
    virtual QString getBinName(int n) const;

    /**
     * Set the name of bin n.
     */
    virtual void setBinName(int n, QString);

    /**
     * Set the names of all bins.
     */
    virtual void setBinNames(std::vector<QString> names);

    /**
     * Return true if the bins have values as well as names. (The
     * values may have been derived from the names, e.g. by parsing
     * numbers from them.) If this returns true, getBinValue() may be
     * used to retrieve the values.
     */
    virtual bool hasBinValues() const;

    /**
     * Return the value of bin n, if any. This is a "vertical scale"
     * value which does not vary from one column to the next. This is
     * only meaningful if hasBinValues() returns true.
     */
    virtual float getBinValue(int n) const;

    /**
     * Set the values of all bins (separate from their labels). These
     * are "vertical scale" values which do not vary from one column
     * to the next.
     */
    virtual void setBinValues(std::vector<float> values);

    /**
     * Obtain the name of the unit of the values returned from
     * getBinValue(), if any.
     */
    virtual QString getBinValueUnit() const;

    /**
     * Set the name of the unit of the values return from
     * getBinValue() if any.
     */
    virtual void setBinValueUnit(QString unit);

    /**
     * Return true if the distribution of values in the bins is such
     * as to suggest a log scale (mapping to colour etc) may be better
     * than a linear one.
     */
    bool shouldUseLogValueScale() const;

    virtual void setCompletion(int completion, bool update = true);
    virtual int getCompletion() const { return m_completion; }

    QString getTypeName() const { return tr("Editable Dense 3-D"); }

    virtual QString toDelimitedDataString(QString delimiter) const;
    virtual QString toDelimitedDataStringSubset(QString delimiter, int f0, int f1) const;

    virtual void toXml(QTextStream &out,
                       QString indent = "",
                       QString extraAttributes = "") const;

protected:
    typedef QVector<Column> ValueMatrix;
    ValueMatrix m_data;

    // m_trunc is used for simple compression.  If at least the top N
    // elements of column x (for N = some proportion of the column
    // height) are equal to those of an earlier column x', then
    // m_trunc[x] will contain x-x' and column x will be truncated so
    // as to remove the duplicate elements.  If the equal elements are
    // at the bottom, then m_trunc[x] will contain x'-x (a negative
    // value).  If m_trunc[x] is 0 then the whole of column x is
    // stored.
    std::vector<signed char> m_trunc;
    void truncateAndStore(int index, const Column & values);
    Column expandAndRetrieve(int index) const;

    std::vector<QString> m_binNames;
    std::vector<float> m_binValues;
    QString m_binValueUnit;

    int m_startFrame;
    int m_sampleRate;
    int m_resolution;
    int m_yBinCount;
    CompressionType m_compression;
    float m_minimum;
    float m_maximum;
    bool m_haveExtents;
    bool m_notifyOnAdd;
    long m_sinceLastNotifyMin;
    long m_sinceLastNotifyMax;
    int m_completion;

    mutable QReadWriteLock m_lock;
};

#endif